Chair base or similar article



FIG. 1 is a perspective view of a chair base or similar article, showing my design;

FIG. 2 is a perspective view of a chair base, showing a second embodiment of my design;

FIG. 3 is a perspective view of a chair base showing a third embodiment of my design; and,

FIG. 4 is a perspective view of a chair base showing a fourth embodiment of my design.

The chair base forms are generally symmetrical about a vertical axis while the undisclosed bottom surfaces are unadorned. 

The ornamental design for a chair base or similar article, as shown and described. 